July 2001
Intermediate to advanced
656 pages
15h 51m
English
book
Applying UML and Patterns: An Introduction to Object-Oriented Analysis and Design and the Unified Process, Second Edition
by Craig Larman
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6.4. Use Cases and Functional Requirements
Use cases are requirements; primarily they are functional requirements that indicate what the system will do. In terms of the FURPS+ requirements types, they emphasize the “F” (functional or behavioral), but can also be used for other types, especially when those other types strongly relate to a use case. In the UP—and most modern methods—use cases are the central mechanism that is recommended for their discovery and definition. Use cases define a promise or contract of how a system will behave.
To be clear: Use cases are requirements (although not all requirements). Some think of requirements only as “the system shall do...” function or feature lists. Not so, and a key idea of use cases is to (usually) ...
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